sugar loaf
A Gorge. Your Welcome!
A "fissure" is a crack or break in something. You might use the word "fissure' to describe a steep-sided canyon, something that looks like a crack in the mountain. You would not use "fissure" to describe the mountain itself.
A steep-sided hill or mountain that stands alone and is usually smaller than a mesa is called a butte.
Caldera/ crater.
An arete is a mountain ridge that is steep sided and narrow along the ridge.
In steep sided, snow covered mountain valleys.
Gorge
A butte is a steep-sided hill or mountain that stands alone and is usually smaller than a mesa. Its distinct shape is often created by weathering and erosion of surrounding rock layers.
A barranca is a steep-sided gulch or arroyo.
A canyon.
ash and lava
DUNE